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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f58472be7ddc87006d3279afbc447c54b9ea084761dcc37d3553ee578df196' 
  AND token = 'vuD/WoRk9CKwkUbd2eqqYgccYovvdYk+T6W5jKMacuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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