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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58983a9526f7e7764bfd107efa9dc29f90c9106715118875fabcc925d04f76e' 
  AND token = 'nsNqf1nx/hVun40f49LLlLtZasTBYtcqWLhqbrTvvDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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