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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5686c062fd3df8e8cd40760742082892da6b69dff51e46cfe0dda26762e460ee' 
  AND token = 'RM03lXqlLC2S6SyQKjV3XYOP1Ok6zujUaq7AwqVYgGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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