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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d1477d6f95510ae6d1dbf72c22688950c9251e22fcc6fb11a9bc5c4c590371' 
  AND token = 'BsUyIKPEU5ituiJXQN5XjJK+3YG7AznTYxAuLkK49A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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