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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c083a5a0d9babdaa6433edde742220478ce3fc40eb6ddec5eb0f98a42499edb2' 
  AND token = 'bkqfps93ui2qnwzUqUSadESVBI6afYpsxslavNdRblk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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