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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2148a1cf9353b78261815cf910e4f27e48aeb525e62e3e8aa28d5072f0721c' 
  AND token = 'FUAF+qj/m2ieFVgIafFzfmxHoZyQtB0FQN+TJZotDq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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