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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8da6aa5c46c394bb3e11b13ec95771efe5eaa588d88969c467221817b3c33a' 
  AND token = '0R6bm3Os8LJIxUX8jIOSGfcOshS5SR7PC8RWGTO7ysQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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