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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a23a9d87b4bac0b00ffe3d4823069a4ca7c0da602319404e09b3f5baa1d61e' 
  AND token = 'k2Unql6sOztpE1lAZqkitvvHZR2gN85KensCOYbubj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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