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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b19e09340c1b3d4095df52bfb06813a591a8ea5673dd3e5d52517c40dd01cbc' 
  AND token = 'vC27mxAtWxH+YDaQgP3+naEZE7g4PlPJutwOEAWqJTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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