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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481e95061e579077edbcf0c62d63c088667fb6abdc563742f6fa2e21dd20e03a' 
  AND token = 'pwRdjKT2xO3jm4OFhM6iWaWFKGL+sYksFt4U+pZ9qo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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