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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a048e0dcc50db0af7756040b40ee6830e41ecb7ad904f4268f610b12fcda1ab' 
  AND token = 'ZQCbBqNrb8QybeqPXeYUU2w8YqYUxUJ9uWUKDBtwhY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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