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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4866fc474cf099eafeb8236bba6ffc8d751845bfb4915c5f46b8cf46733619' 
  AND token = 'FZXKvMonjFc3mGIZC91pHbiZbtvzj5wrpSVEpLjFrcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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