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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bcc5df44b488e317717459706606260dc28afd096d4411f31a9d92a772b70c' 
  AND token = 'DzkM/vkTh7oUKwX9SxjaP4RmbInr0oGOSNjNJG40i9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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