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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303363143087d6be560758da81acf7c754bc4cc7c9d79a79ad7f43690bb7488c' 
  AND token = 'exQbNhrlOVKH8hcIS2pe2R1mYZFBrj8CEspXnRpc4aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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