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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6bb68c4f668f9f937ba80884d07dbadf1ed2337e3f4b35bc0c0be889a3ff6e6' 
  AND token = 'ot4j0konKjhl9IarbxbjDjacJaN1UBzFS8D8SP7MC0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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