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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f215c5e6267031625380259ed5c18248f32be387c25a5f1e4a9f43528629479d' 
  AND token = 'LrvEc9CST9wpe/3u9OmLYBLblfwc5yWR8RJ2oWQKxiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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