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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960cd3f92a0c885f7ffbb2966eb93bee48abd554d06de848cd1e8d747346a5e8' 
  AND token = 'g6cx9D3C5CSNFatixlwTlVzbwrU5EP058zv+z0fXiQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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