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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555b2e120ee716573168967bd4d42a57d977d1ac1567a14518817b0433b2b775' 
  AND token = '68T+EI7pEIaYLj8MacfRYgWa/6o/oIZTxW4zz2rZoLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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