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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4ff59da41efca3e84263c1b8a86e373f04292cc1a00fe2c7f49d56f27ba7b2' 
  AND token = 'KgaT9tUWWLQ3u92rWauCw5qD9AGi5Q00a8aTaZbB5n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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