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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd637b29f8ac76adf3cee16b8b956bfa8cca264fe7fb24146b0df3aa074782262' 
  AND token = '66ME+Y2jOPHR/EitsxnMlLxOpSyLcdii+vWu/YwP+Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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