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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0928d31b047ac5453f11d42040c53af58fccab76123231bb586044b2561373c9' 
  AND token = 'DtcEtiZN1/O1YHBrXZ/UnuvPPAvO2RB8oettGg353uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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