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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b657868a7b5a2695c8371911a6c4e596083284c1ac20e0d16b37e6b378f7bd' 
  AND token = '2tu8nNka0VlP24VKjg/axeHlcHxa6Ol6XlLHT2uIhBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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