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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a6b466521c5ac19b8d3ad5462579176e6159dab55fddb335d3ed460841e92a' 
  AND token = 'xVjC9RKCYTYA9KQCUaGg5YP3+WW047JT6Hp6/QeJIFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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