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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a5406daf996648f706d61f78808b06f09ed6d0205e571547fc703ba6a25ce7' 
  AND token = 'SWrCKuWPzgSA21HnD+Movm1qXouv1ml76LnRogvNyHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00528

JSON explain

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