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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0235ff2384f8d6e686c9e94915edbe1699515947fad04b9f46096fafbd68379' 
  AND token = 'F5w1q1fUTNlVPp6LX23oUuv79lmVdI0jL/5KDpYrV3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}