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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980d25125a7e7ad17a71901d718fb38f8904361ad864cff73f213e3955ae1d37' 
  AND token = '9bij0yjspejozOlogRxTQLHn13MwK1djuPQHIFbVAaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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