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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5d993d26daa8dfd546e5df08a500fcdf42893a52d41b200e826e703b1a56ee' 
  AND token = 'bv3Q6tfqXlKBU3NJTUAlrbwaCh2m3pAmmOJayy+zIs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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