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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a41e25a8ac41a3a3b46db7195af9d338c278e46fbdc9f38c8f7641845433bf' 
  AND token = 'eX6eVWATqZI2+hgcpIN7D9oX721ZEBNDttqyhU82bEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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