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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0162cb9a74d31a5d1a4609228f15175ea1fc2870f10cfe73e09c72de54aa1b5d' 
  AND token = 'dHLa7CNZXu9dlBsrXXt/vDlWGifJY2++A++uBM7uLLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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