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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1d029d0c52380fdf73f794629384f9fa2c79e2ec5dd5cfa9c0e90f0359da5b' 
  AND token = 'Zn/B4Two3WGBDQO0sTHPmDYn7Igx4KICDiCad3lY0C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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