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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6596f9a33824a5c5ee2fc8f613bcf3d0f2e802383b59f074a44d35a0c09544c5' 
  AND token = 'E/r6nAZt8nAXRnOWH7olM5P7KJgsFBpqp/yDMsaOEtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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