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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c2d464cbbb7191ef2cbdb96133697e78b158d78c25a9868a281c8345d81a88' 
  AND token = 'Zt0MJQdOEhN4qDHwuiCNpTl9fOcYcnUordW4q/yojH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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