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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96651f266409203c10ea689719f61abaa49cd98f423f52c44e7dd7d9b789bfee' 
  AND token = 'Q9CgUwAKERO8sbwIXxvLMLwp91cfyLHM/ESH0lmLCFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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