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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb54df9387d9311f829105642ec67fc89a20bee055cf06adf3a9b08fb3d0c8c' 
  AND token = 'rWicq86A/KAHhofXKvutFFFMktU8+Zghdo4DeHfh958=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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