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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f44dc4306016b1d8005f16848f8d0a4c730ee960a72fd5dfcf69943b7cddf9' 
  AND token = '/eDnbOvnH3CPr9y2MP+aotp5RjnpdUwNBcHa4QhY7Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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