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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061b40d8e608c93d4d097582693d0dabe68c296016cb1f561040bb8fb424c300' 
  AND token = 'ev1+1rQgBYnG/T9HrG8t+PWJsTTVvtynNEOiu0ffQEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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