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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac03df2d4c5438a804dc1f37a43c2ab6e7cf573eacb0ef7e3d65759d819b4a1' 
  AND token = 'e12X6CZupQ1HUwocaJXOuBa0GlwTLJ7N2qP/GziR678=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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