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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be8a9bac9edc91864305cfee69e7b0e5f1e11092ec27c719ab94a84090f7b59' 
  AND token = 'Y78sQBQPTY5HiycAtb0zghC2iB1Eqe+X4nJxeUFMzqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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