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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7304eead918a29bd688e6e83a012f05873071fc0a36e84ab18cd966202583e8d' 
  AND token = 'rxmgGLCi+CmuAThxKr6Byb5L+C4s7x+CwFJL2SFYmuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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