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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df1fb4aca949e7fc6a3e3bbe3bf0f93acd66bdbd301c1943380cb40df467b69' 
  AND token = 'ED+XfL/3cjHSrEJ5Q7A/MlYxXcs0Dk2/IIgGxPZxyHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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