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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15f69b4a9382f4fa0e39d2bd722d23b7738c529a5d07283a72d4393ed8efb6b' 
  AND token = 'Xtz6mtFQweKkFlim2JE0BCZA0Tm2dM9EzWF8cgk+8Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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