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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a86a9d09990fafafac9f9ed20248a3cba3b822e6fae151e5ea6d26e9141abf' 
  AND token = 'fMiioUZZCcoy0nBwtFRgOnoa7HuXO0MnykXh+/sgpPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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