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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bece6c15ae98f4c6d091bcb9320f186839c2399e7db2a5dcd588878326256771' 
  AND token = 'r9qlFoH+4woNMJeFrro1So7jSiL8xpCiFgy/2IjL5rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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