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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbad21b370c30398ec7dc757c8fd4a5f5e98f3adde15c44f83060c8c6ea6eea' 
  AND token = 'acDg8E2AmHb8D8YNugAZKO7aQd4/3zcADc5HtIoA4Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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