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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b66c1b72f4ae947d467ac937f1818e074da65eca0873cbd4a7d95c9401b747' 
  AND token = 'grd2yla89iEBjQ0h+8CHjWouhwPl9kDz4TLM+DIu/FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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