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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09404cf8d8b421ba789bd0346d094e03226fcbd7bcbfe27685fd5ad2e182674b' 
  AND token = 'sLvh4lB9OUFlExA2KAJxAC7Wxc1zRdcZkU/XBUQeCDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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