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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90485fc659af60e56a88861e945a9e4c0f1cfee870e3cfaa9f122fca6beadd1f' 
  AND token = 'GSf+O3LgH2h1N2z5NWBV/NV6AB3J0ZZuKkSHwiPH7Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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