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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91553bbcdeb412578ecdb19e39b038197ea3e3871c909bea00592a26d2ade4a4' 
  AND token = '8s5V8EqMTFSW13dbgyoQ4wXtdqrPHtsCJelQ3au+6mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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