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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1834899e2bb196a6686fc8210501fe23aa9d560c1e1af84d1c592872780d0d' 
  AND token = 'trNlMcKVghg0PzZAungJdT1bL+9Lu47LYNY3D76pWb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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