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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f379feaf60465131abf8c96f7898780d29ae259a8e8a8302cb4508ed7bf55d' 
  AND token = 'h6GveQEvSFSu3IRM4c3UGhkc7ON6X91I9h7vNCj5BqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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