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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6545a002f286df0c3107f9dccfe4ccec73b1dad73918f1a57a795feefc742bf2' 
  AND token = '7pc6nbvAEgxxVeQM3uxEtvT8uunNluT0ismwXDWCbOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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