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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc2d2669341e50a8dcd9b9babb53ce199f8972a10097b7bde7f3a38ef34d98a' 
  AND token = '06/PNf0KvlGD1hsf2JghpS2mvr9Ma6+PyyMcVRdlkL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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