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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f6be6cbac85de162b2beb2e690dc2e7171cbe708b8332775bbd735e5c586fb' 
  AND token = 'gurCn3FWL/1F+2dvOR2viNRHgxNRsB5T1ukeRA2rlhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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