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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17b4df463297720d8c2085a3fe8194c06a4edf5853c32efd73ad2dd54431a69' 
  AND token = 'AaJ4pHeY0bS+9sE8f0G2LuCoN25o6cBtTZE4rvo3aXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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