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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37e880662d477c32a732c1ac54cbaae9e7b9c1878fedfa23867fb6ee5203e76' 
  AND token = 'BAoTyP2h/zR9UUBVEmmXnqdZDeTX8rjcRYI4KS+cUh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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