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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d05cd9b1b0e3db538c4193a544a8dcdbc2c4302033e4d978077aa1ba8c1e45' 
  AND token = 'RYOZs6W4U2ol2OKWxNluJ5qCXHK2pCDnCbYJ6jjL9OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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