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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2b98962ba65953da9057e3744cee660ba556f8e10738a18513dbd0a260dfa7' 
  AND token = '/DVshSowZpyIP8SLnhKglLr0yA50yQM6uOaL36cIOHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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