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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a93c6c6d70fc5d4f430f99d800a02e290e10b9fa17fe1546ff3faa59b519c5' 
  AND token = '9Lv2kupbRFa6RUVcUAbdbzK8MYY+ETYtx0af2JdVblg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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