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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69392a08514a233d61702e205ace6691804d4084187304e1d29504016b1dc29a' 
  AND token = 'hFbaAAf0BlNkcQyWPvAFr9E8nIs5N87zzXvpL6QswpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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