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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e823cfc93004cdf3c4762faed42aa62cf9f542c3b1a8ca0fd7e4f5a7dc7cff91' 
  AND token = '91eZ7BWAljQfhWUv0MqHaPRvDjjJp7CZ9xVzApDxby8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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