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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afb91cd0ec42960d6ef715752b3fbea6d2e197ab8e3a2ab32a689f76ed32cce' 
  AND token = 'ljvT7leOmQz4XkPu0MAybOt/DAK6v+R/X303bXqjRNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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