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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9a00bb7a7a80509bd3d2efb3449d07ea6168ff1d1f91a833e0b15a8fde62e2' 
  AND token = 'ed26T0r/zjakp/gDOA7fG10C9DJmAPUonKulumpwhb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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