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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108067e3fbae88b26e40cf47e20862eff50336d0281314ea730e2679d759cd84' 
  AND token = 'z/Q0CxdRgq1fXNl92o76sY0k7PWS59rkTWkhL3TcjlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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