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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0679ad166e1d50a4b1e8260b6debec5c4db01cee15b854410e7c16733a1f2ae' 
  AND token = 'bV1Q9N4XeNQ26TWyFYtnlilrefZiugu04yRArEnlc4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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