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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29a0d419f62d70ef83e0f1190b64788bc84c2bf8509e1520bbc6d0c656240c5' 
  AND token = 'ZaOZyTs0SpCqEPMdta4+ClJkT09qymtHh32TABA3j4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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