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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff9bbc8ff5e134231b81bd1f542808c2991d3af5fc5015c3aae736f9a6dced9' 
  AND token = 'OGqs7brKYVK1yVuV/eX0YxQj+RcxZ/b0qd5/7QbNDxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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