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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61df41cecdb4609ee5f6dc1c098568d510f958027342b45d850d9a3aa74a248' 
  AND token = 'UrrWmIxPqv/TaxSG9sCAnI4Sk5N/Bah9Qna8szUSJ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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