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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4bffb54c2154fe11def91e5cdcc2e2046e02ad17c3480540c480e3383d6c1a8' 
  AND token = 'DhF4ON8SbYq9KBzYAew++VJM8rWWnmE+yokIvODwYrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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