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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313b189f8be21ac8137515d6a9c56ea9ca929b8b36dbaf087e2afb578e2c49cc' 
  AND token = 'qBrdIAJkELUNLra4cKQcl2cwxGo082G1E7xXUT2Zbas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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